Flaky polypyrrole/reduced graphene oxide composite, preparation method thereof and application of the composite as positive electrode material for lithium ion battery
A technology of polypyrrole and graphene, which is applied in the direction of graphene, battery electrodes, secondary batteries, etc., can solve the problems of fast capacity decay, low reversible capacity, and many irreversible oxygen-containing functional groups, so as to facilitate intercalation and deintercalation , Accelerate the transmission rate, the effect of long charge and discharge cycle life
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Embodiment 1
[0037] Weigh 2g of natural flake graphite and 90mL of concentrated sulfuric acid with a mass fraction of 98% in a 500mL beaker, fully stir at a rate of 300r / min in an ice bath at 0°C, slowly add 10g of potassium permanganate, and react at 0°C for 2 hours , react at a medium temperature of 48°C for 3 hours, then slowly add the reaction solution to 200mL of distilled water, then raise the temperature to 100°C, and react for 0.5h; when the temperature of the reactant drops to 60°C, add 30mL of peroxide with a mass fraction of 30% Hydrogen, then stop stirring, let stand to separate layers, wash with distilled water until the pH value of the supernatant is close to 7, and freeze-dry the slurry to obtain graphite oxide. Weigh 50 mg of graphite oxide and add it to 100 mL of distilled water, stir for 0.5 h, and ultrasonically disperse for 4 h to obtain a stable graphene oxide suspension, add 100 μL of pyrrole, stir for 10 min to mix evenly, and then place it in a 60°C thermostat for 8 ...
Embodiment 2
[0040]The preparation method of graphite oxide is the same as in Example 1. Weigh 100 mg of graphite oxide and add it to 100 mL of distilled water, stir for 0.5 h, and ultrasonically disperse for 4 h to obtain a stable graphene oxide suspension, add 100 μL of pyrrole, stir for 10 min to mix evenly, and then place it in a 60°C thermostat for 8 h. After cooling to room temperature, freeze-drying is performed to obtain a sheet-like polypyrrole / reduced graphene oxide composite.
[0041] The same method as in Example 1 was used to prepare electrodes and assemble batteries. The assembled battery was tested for electrochemical performance.
Embodiment 3
[0043] The preparation method of graphite oxide is the same as in Example 1. Weigh 200 mg of graphite oxide and add it to 100 mL of distilled water, stir for 0.5 h, and ultrasonically disperse for 4 h to obtain a stable graphene oxide suspension. Add 100 μL of pyrrole, stir for 10 min to mix evenly, and then place it in a 60°C incubator for 8 h. After cooling to room temperature, freeze-drying is performed to obtain a sheet-like polypyrrole / reduced graphene oxide composite.
[0044] The same method as in Example 1 was used to prepare electrodes and assemble batteries. The assembled battery was tested for electrochemical performance.
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